NPTEL Air Pollution and Control Week 3 Solutions

This set of MCQ(multiple choice questions) focuses on the NPTEL Air Pollution and Control Week 3 Solutions

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Week 0: Assignment Solutions
Week 1: Assignment Solutions

Week 2: Assignment Solutions
Week 3: Assignment Solutions
Week 4: Assignment Solutions
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Week 8: Assignment Solutions
Week 9: Assignment Solutions
Week 10: Assignment Solutions
Week 11: Assignment Solutions
Week 12: Assignment Solutions

NOTE: You can check your answer immediately by clicking show answer button. Moreover, this set of “NPTEL Air Pollution and Control Week 3 Solutions” contains 10 questions.

NPTEL Air Pollution and Control Week 3 Solutions

Q1. Atmospheric stability is associated with the___________.

a) Temperature profile 
b) Pressure profile
c) Relative humidity profile
d) Rainfall profile

Answer: a) Temperature profile 

Q2. Which of the following factors is associated with the plume properties? 

a) Wind Speed
b) Turbulence
c) Exit velocity
d) Atmospheric Stability

Answer: c) Exit velocity

Q3. A radiosonde equipped with various measuring devices is carried up to high altitudes by a balloon filled with__________. 

a) Hydrogen
b) Radon
c) Argon
d) Nitrogen

Answer: a) Hydrogen

Q4. Which of the following air pollutants is NOT included in the criteria pollutants?

a) CO
b) CO2
c) Pb
d) O3

Answer: b) CO2

NPTEL Air Pollution and Control Week 3 Solutions

Q5. Annual National Ambient Air Quality Standard for SO2 (in μg/m3) in Industrial, Residential, Rural, other Areas is

a) 50
b) 60
c) 70
d) 80

Answer: a) 50

Q6. Calculate the sub-index for the given conditions: 
PM10 conc. of 90 μg/ m3, BHI= 100, BLO= 50, IHI= 100, ILO= 50, and CP = 85 μg/ m3

a) 80
b) 85
c) 90
d) 95

Answer: b) 85

Q7. When an air pollution index does not indicate poor air quality even though concentrations of one or more air pollutants may have reached unacceptably high values, it is called

a) Maximum operator approach
b) Minimum operator approach
c) Eclipsing
d) Ambiguity

Answer: c) Eclipsing

Q8. As per the method adopted by CPCB, if the Air Quality Index (AQI) is 120, the corresponding air quality rating will be

a) Minimal impact
b) Minor breathing discomfort to sensitive people
c) Respiratory illness on prolonged exposure
d) Breathing discomfort to people with lung, asthma, and heart diseases

Answer: d) Breathing discomfort to people with lung, asthma, and heart diseases

Q9. The trajectory model comes under which of the following air quality modelling classification 

a) Coordinate systems
b) Level of sophistication
c) Time period
d) Pollutant type

Answer: a) Coordinate systems

NPTEL Air Pollution and Control Week 3 Solutions

Q10. Which of the following models is based on the Gaussian model?

d) ATMoS

Answer: b) AERMOD

Previous Year – NPTEL Air Pollution and Control Week 3 Solutions

Q1. According to the Pasquill-Gifford stability classification, the stability class ‘E’ is:

a) Very stable
b) Slightly stable
c) Slightly unstable
d) Neutral

Answer: b) Slightly stable

Q2. Identify the type of plume based on the figure given below (DALR- Dry Adiabatic Lapse Rate and ELR – Environmental Lapse Rate): 

a) Looping
b) Coning
c) Fumigation
d) Lofting

Answer: a) Looping

Q3. The bottom 10 % of the atmospheric boundary layer is called as

a) Surface layer
b) Stable boundary layer
c) Residual layer
d) Mixed layer

Answer: a) Surface layer

Q4. As per CPCB recommendations, the minimum value for chimney/stack height adopted for industries except for thermal power plant is ___________.

a) 30 m
b) 20 m
c) 15 m
d) 10 m

Answer: a) 30 m

NPTEL Air Pollution and Control Week 3 Solutions

Q5. _________ is the number of times monitoring data is obtained and recorded over a specified time interval.

a) Measurement Techniques
b) Indicator(s) of performance
c) Monitoring Frequency
d) Averaging time

Answer: c) Monitoring Frequency

Q6. Cities in which the ambient air concentrations have consistently exceeded the National Ambient Air Quality Standards (NAAQS) for a period of 5 years are called as

a) Attainment cities
b) Non-attainment cities 
c) Megacities
d) Green cities

Answer: b) Non-attainment cities

Q7. When an air pollution index gives a false alarm even though concentrations of all the pollutants are within the permissible limit except for one pollutant, it is called 

a) Eclipsing
b) Ambiguity
c) Maximum operator approach
d) Minimum operator approach

Answer: b) Ambiguity

Q8. If AQI comes out to be 169, what would be the AQI category as per CPCB?

a) Satisfactory
b) Moderate
c) Poor
d) Severe

Answer: b) Moderate

Q9. Classification of air quality models based on the coordinate system is:

a) Short-term and long-term models
b) Reactive and non-reactive models
c) Grid-based and trajectory models
d) Screening and refined models

Answer: c) Grid-based and trajectory models

NPTEL Air Pollution and Control Week 3 Solutions

Q10. Air Quality Modelling in Urban Regions using an Optimal Resolution Approach (AURORA) model is based on 

a) Box model
b) Eulerian model
c) Gaussian model
d) Lagrangian model

Answer: a) Box model

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